I don't really need to evaluate the function at any interior point. I eventually wanted to project the boundary data obtained from the solution to another FE_FaceQ of different degree defined on a different triangulation. So to pass a boundary_function map to vectortools::project_boundary_values, I was planning to use the FEFieldfunction to first define a function from solution vector corresponding to dof_handler_faceQ. I assume it won't work because FEFieldFunction uses Fevalues instead of FeFaceValues at quadrature points. How else can I pass the boundary data obtained from FE_FaceQ to vectortools::project_boundary_values.
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